Estimates for the first eigenfunction of linear eigenvalue problems via Steiner symmetrization
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F. Chiacchio
By means of Steiner symmetrization we get some estimates for the first eigenfunction of a class of linear problems, having as prototype the Laplacian with Dirichlet boundary conditions.
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Chiacchio, F. «Estimates for the first eigenfunction of linear eigenvalue problems via Steiner symmetrization». Publicacions Matemàtiques, 2009, vol.VOL 53, núm. 1, p. 47-71, http://raco.cat/index.php/PublicacionsMatematiques/article/view/140646.